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Phone Directory 312-621 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-621 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-6210###
312-6211###
312-6212###
312-6213###
312-6214###
312-6215###
312-6216###
312-6217###
312-6218###
312-6219###